RFR: 8177418: TimeZone.getTimeZone(String id) throws NullPointerException when id is null

[Naoto Sato]

On Fri, 6 Jan 2023 22:38:13 GMT, Justin Lu <duke at openjdk.org> wrote:

> When ID is null, TimeZone.getTimeZone(String ID) throws a NullPointerException.
> 
> For example, 
> 
> 
> String someID = null;
> TimeZone tz1 = TimeZone.getTimeZone(someID);
> ``` 
> 
> throws a `NullPointerException`
> 
> This change updates the documentation to make this apparent.

LGTM. Please file a CSR as Lance suggested.

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Marked as reviewed by naoto (Reviewer).

PR: https://git.openjdk.org/jdk/pull/11888